And yet another Dino ID thread

[Alan_J_MN]

I thought I had cyano... but it is dinos.

This is what it looks like in the tank:

I believe I have ID'd them using a microscope and @taricha s PDF, but looking for confirmation.

These are from my rocks, higher up. I think these are Ostreopsis, but not 100% sure.

These are from my sand bed. I'm pretty sure the larger ones are Prorocentrum, and the smaller ones are the same as in the other video.

 

[taricha]

Bottom are Large Cell Amphidinium
Top video are not a dino at all but look like what I found in my system occasionally: cryptomonas or rhodomonas

 

[Alan_J_MN]

Thanks @taricha. That makes me feel a bit happier... but more confused. From your ID pdf the larger ones look (to me) much closer to your pics of prorocentrum: they have a well defined circular piece in the middle and are more symmetrical. What did I misss in the ID?
I couldn’t find much info about cryptomonans or rhodomonas. Are they as much of a concern like dinos, or less so. What are the eradication measures?

 

[taricha]

From your ID pdf the larger ones look (to me) much closer to your pics of prorocentrum: they have a well defined circular piece in the middle and are more symmetrical. What did I misss in the ID?

Benthic prorocentrum and amphidinium are distinguished by the front feature of the two.
paper pic of several prorocentrum shows they all have a notch / cavity in the front.
paper pic of several amphidinium shows they all have a tongue / nose / beak (epicone) at the front.

the central circular structure (pyrenoid) can show up in either one so it's not a good marker to distinguish - though it is more common in prorocentrum.